Lathes



A(No Model.)

J.R.BAGK. REST POR METAL TURNING LATHIES. No. 455,466. Patented July 7, 1891.

' jwawtofc w www A/ @Momma WM Y .I Il. m z Emma W vl//U dxf,

UNITED STATES JOHN R. BACK,

PATENT OFFICE.

REST FOR METAL-TURNING LATHES.

SPECIFICATION forming part of lIlettersPatentNo. 455,466, dated July 7, 1891.

- Appnttion nea February 2s, lass, serial No. 301.574. (No model.;

. To @ZZ zchom t may concern: ,g

Beit known thatl, JOHN R. BACK, av citizen i of the UnitedStates, residing at Worcester,

in the county of Worcester and Statevof sachusetts, have invented certain new and.

alsoa portion of the tool-rest being shown in sectional view. Fig. 2 shows a sectional view on line X X, Fig. l; and Fig. 3 represents a portion of the tool-rest in sectional viewupon line Y Y, Fig. l.

Similar letters refer to similar parts inthe several views.

My invention relates to that portion .of aj metal-turning lathe employed insupportingv the cutting-tool; and it has for its objects to provide means for the rigid support of the cutting-tool during the operationof cutting, to provide means whereby the cutting-tool `can be raised or lowered with reference to the work, and to provide means for the replacement of the nut by which the transverse feeding motion of the cutting-tool is effected, and in the construction and arrangement of the several parts, as hereinafter described, and set forth in the claims.

Referring to the drawings, A A denote the ways of an ordinary metal-turning lathe; B, a carriage having a sliding movement along the ways A A and providedwith transverse ways ct a, upon which the slide C is placed, capable of sliding transversely to the ways A A, by means of an actuating-screw D, held in the carriage B and passing through the nut E, so attached to the slide O that the r0- tation of the actuating-screw D will cause the slide to be moved upon theways a a. As the nut 'E is liable to become worn in use, I provide for its replacement by attaching a sleeve F to the slide C by means of the screw-threadj ed bolt b, a projecting lug c on the sleeve entering and fitting a corresponding recess-cl in .the slide@ in order to prevent the sleeve F from being moved out of l its alignment with theactuating-screw D, whose axis is coinci- QF VORCESTER, MASSACHUSETTS, ASSIGNOR OF ONE-HALF TO FREDERICK E. REED, OF SAME PLACE. i

`dent with that of the sleeve F. Thenut E is `turned upon the outside to lit the sleeve F, and is provided with a liange G upon one side, which enters a recess ein the sleeve F,

to which the liange Gr is` attached bythe screw f. When the nut becomes-worn by use, the actuating-screw is withdrawn from the nut and the nut removed from the sleeve F by withdrawing the screw f and giving the nut a partial rotation to remove the flange G from the recess e, allowing the nut to be readily removed from the sleeve and a new nut inserted in the sleeve, iitting the interior of the sleeve and having its outer surface concentric with its screw-threaded bore, thereby bringing the axis-of the nut concentric with the axis of the sleeve, which is permanently attached to the slide C with its axis coincident with the axis ofthe actuating-screw D. Thenut is thus readilyreplaced whenever desired without requiring adjustment to the actuating-screw, and new nuts are readily and cheaply fitted for useV by simply making them cylindrical with their outer surface concentric with their screw-threaded bore and fitting the bore of the sleeve F.l

Upon the upper surface of the slide and integral therewith is a hollow cylindrical boss H, open at one side and provided` with the lugs g g, through one of which the screw h passes, screwing into the other lug. Within the hollow boss H is a cylindrical block J, capable of sliding vertically in the boss, but held from turning therein by means of the spline j, held inthe inner wall of the boss H and entering one ot".the corresponding grooves 7" l7" j in the block J. Projecting above the block J is a post J concentric with the block 4J and carrying a strap J 2, resting against tlie shoulder 7c and held in position by the nut 7c. lhestrap J2 has a heel J3, bent downward and resting upon the upper surface of the block J, and upon opposite sides of the post J are placed the tighteningscrewsl l, arranged in pairs, for the purpose of binding the'cutting-tool upon the upper surface J4 of the block` J. I'leld concentrically with the block J and post J and capable of turning freely therein is a bolt K, provided with a screw-threaded section K at its lower end, entering a screw-threaded hole K2 in the slide. The bolt K is held from moving longitudinally within the block J and post J by means of a flange K3, held in a recess in the washer K4, attached to the under side of the block J by means of the screws m m, Figs. 2 and The upper end of the bolt K is lit-ted to receive a wrench L, by which the bolt is rotated in the screw-threaded hole K2, thereby raising and lowering the block J by means of the flange K3. The cutting-tool is placed upon either side of the post J', and beneath the strap J 2, with the'points of the binding-screws Z resting upon its upper edge and pressing it upon the surface J 4; or, if it is desired, two tools can be used upon opposite sides of the post J and in the spaces N N', Fig, 2, and the tools are raised or lowered by the rotation of t-he bolt K, the block J sliding upon the spline j. In case it is not required to raise or lower the tools while in the operation of cutting, the block.V J is clamped in the boss II by the clampingscrew h, held in the lugs g g, thereby securelyholding the block J from being turned by the strain 'upon the cutting-tools, and also relieving the spline j from strain. Byloosening the nut 7c the strap J 2 is turned upon the post J allowing the cutting-tools to be placed at an angle with the work.

As the continued use of the cutting-tools upon the surface J 4 in the same position would in time wear the surface out of truth, I employ the spline j and groovesjjj in the block J alternately to hold the block J from rotation. I am thereby able to withdraw the block J from the boss I-I and turn it a partial rotation about its axis and replace it, thus bringing a fresh surface beneath the cutting-tools whenever it is desired to perform an accurate piece of work.

The devices above described for the purpose of raising or lowering the cutting-tools operate independently of any mechanism for imparting alongitudinal or transverse motion to the cutting-tools, and so much of my presentinvention as is concerned with the raisingand lowering mechanism is not, therefore, confined to any specific construction or arrangement of the slide-rest or to the use ot' a sliderest for the purpose of supporting the cutting-tool.

VhatI herein claim as of my invention, and desire to secure by Letters Patent, is

l. The combination, with the slide carrying the cutting-tool, of a sleeve provided with a lug entering a recess in said slide, an attaching-screw by which the screw is attached to said slide, a nut held in said sleeve and provided with a ange entering a recess in said sleeve, and an attaching-screw by which said flan ge is attached to said sleeve, thereby holding said nut from rotary or longitudinal movement, and an actuating-screw passing through said nut, substantially as described.

2. The combination, with the slide carrying the cutting-tool, of a sleeve attached to said slide, a nut held in said sleeve and provided with a flange entering a recess in said sleeve, an attachingscrew by which said flange is attached to said sleeve and by which said nut is held from rotary or longitudinal movement, and an actuating-screw passing through said nut, substantially as described.

3. The combination, with slide C, carrying the cutting-tool, of a sleeve F, having a lug c, entering a recess d in said slide, attaching-screw by which the sleeve is attached to the slide, a nut held in said sleeve and prevented from turning, and an actuating-screw passing through said nut, substantially as described.

4C. The combination of the tool-supporting block and a concentric post projecting from .the upper surface of said tool supporting block and provided with a shoulder 7e, a rotating tool-clamping strap journaled upon said post, a tightening-nut 7n', carried on said post, and clamping-screws Z, held in said strap, substantially as described.

5. The combination, with the slide C, of the cylindrical boss II, provided with a recess to receive a tool-supporting block,a spline held in the inner wall of said recess, a tool-supporting block provided with a series of grooves arranged to receive said spline, a concentric tool-post projecting from the upper side of said tool-supporting block and integral therewith, said post being provided with a shoulder 7c, a tool-clampin g strap rotating upon said post, and a tightening-nut held on said post, substantially as described.

G. The combination of a tool-supporting block, a concentric post extending upwardly from the tool-supporting surface of said block, a tool-clamping strap held on said post, an elevating-screw extending through said toolsupporting block and said concentric post, with its upper end projecting above said post and above said tool-clamping strap to receive a wrench, and a fixed nut engaged by said elevating-bolt, an an'nularflange on said elevating-bolt bearing against the under surfaceof said tool-supportingblock, whereby said block is raised by the rotation of said bolt, substantially as described.

7. The combination of a tool-post capable of a vertical sliding motion in ways, a concentric actuating screw-threaded bolt held in said tool-post, a clamping-strap capable of rotating around said tool-post and held on said tool-post, and binding-screws carried in said clamping-strap, substantially as described.

8. The combination, witha tool-supporting block, of a concentric post extending upwardly from the tool-supporting surface of sf :i block and provided with a shoulder K, .f Cl-clamping strap turning about said post IOC IIO

and having one e'ud'bent downward to'resb Executed at Worcester, county of Worupon the tool supporting surface of said cester, and'State of Massachusetts, this 22dA block, a, tighteningmut held upon said conday of February, A. D. 1889.

centric post, whereby said clamping-strap is JOHN R.I BACK. 5 heid in position, and tighteningscrews held Witnesses:

in said clamping-strap, substantially as de- RUFUS B. FOWLER,

' scribed. T. A. WICKHAM. 

